The purpose of this RFP is to solicit bids from qualified entities to perform analyses of speciated fine particulate matter in sample filters. Please see Attachment #1, "Scope of Services" in the RFP for additional information. All responses to this RFP must be submitted electronically using Public Purchase, the District's web-based e-Procurement system, by: 5:00 p.m. PST on Friday, March 25, 2022. All respondents must be registered vendors using Public Purchase in order to submit a proposal. Visit the District's website at http://www.airquality.org/About-Us/Contracting-Opportunities to view instructions on how to register with Public Purchase to receive RFP notifications and download RFP information.